First Synthesis of β-Keto Sulfoxides by a Palladium-Catalyzed Carbonylative Suzuki Reaction
摘要:
An unprecedented palladium-catalyzed three-component cross-coupling reaction between alpha-bromo sulfoxide, carbon monoxide, and aromatic boronic acids provides a new and efficient approach to the synthesis of beta-ketosulfoxides. The reaction takes place under mild conditions with a wide range of variously substituted aryl and heteroaryl boronic acids. The carbonylative cross-coupling reaction is strongly favored over competing direct cross-coupling and homocoupling processes, except with boronic acids carrying strong electron-withdrawing substituents.
A route to benzylic arylsulfoxides from β-ketosulfoxides
作者:Meng-Yang Chang、Yu-Chieh Cheng、Chieh-Kai Chan
DOI:10.1016/j.tet.2016.05.038
日期:2016.7
The K2CO3-mediated benzylation of β-ketosulfoxides 4 with 2.0 equiv of benzylic halides 5 affords benzylic arylsulfoxides 6 in moderate yields along with trace amounts of chalcones 7. The products 6 are assumed to form in situ intermediates of sulfenate anions from β-ketosulfoxides which are commonly involved in carbon–sulfur bond formation. A plausible mechanism has been proposed.
用2当量的苄基卤化物5进行的K 2 CO 3介导的β-酮亚砜4的苄基化反应可中等产率地得到苄基芳基亚砜6以及痕量的查耳酮7。假定产物6原位形成了β-酮亚砜中的亚硫酸根阴离子的中间体,这些中间体通常参与碳-硫键的形成。已经提出了一种合理的机制。
Photoredox-Mediated Synthesis of Functionalized Sulfoxides from Terminal Alkynes
作者:Jaswant Kumar、Ajaz Ahmad、Masood Ahmad Rizvi、Majid Ahmed Ganie、Chhavi Khajuria、Bhahwal Ali Shah
DOI:10.1021/acs.orglett.0c02055
日期:2020.7.17
A photoredox-mediated protocol for the synthesis of α-alkoxy-β-ketosulfoxides and α,β-dialkoxysulfoxides using alkynes, thiol, and alcohols is reported. This work presents a rare single-step synthesis of α-substituted sulfoxides, involving tandem introduction of a thiol and alcohol as a key enabling advancement. Furthermore, the method can be easily employed to access vinyl sulfoxides and β-ketosulfoxides
Visible light organophotoredox catalysis: a general approach to β-keto sulfoxidation of alkenes
作者:Twinkle Keshari、Vinod K. Yadav、Vishnu P. Srivastava、Lal Dhar S. Yadav
DOI:10.1039/c4gc00857j
日期:——
A mild, simple, efficient and metal-free approach to β-keto sulfoxides utilising eosin Y as an organophotoredox catalyst has been developed. This general protocol offers a direct and rapid difunctionalization of alkenes using thiophenols and atmospheric oxygen at room temperature in a one-pot procedure. The utilisation of visiblelight and air (O2) as inexpensive, readily available, non-toxic and eco-sustainable
Pummerer Reaction of Sulfoxides in Acetic Anhydride Catalyzed by Al-MCM-41
作者:Suguru Ito、Yoshihiro Kubota、Masatoshi Asami
DOI:10.1246/cl.150896
日期:2016.1.5
The Pummerer reaction of acetic anhydride with both alkyl aryl sulfoxides and dialkyl sulfoxides was efficiently promoted by a mesoporous aluminosilicate Al-MCM-41 to afford the corresponding α-ace...
Enantioselective Organocatalytic Rearrangement of α-Acyloxy- β-keto Sulfides to α-Acyloxy Thioesters
作者:Francesca Capitta、Angelo Frongia、Pier Paolo Piras、Patrizia Pitzanti、Francesco Secci
DOI:10.1002/adsc.201000376
日期:2010.11.22
The first highly enantioselectiveorganocatalyticrearrangement of α-acyloxy-β-keto sulfides to α-acyloxy thioesters has been developed which provides a number of important synthetic building blocks in high yield and with excellent enantioselectivities (ee: up to 92%).